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Postretirement Benefit Plans (Plan Assets) (Details) - Fair Value Of Plan Assets [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Pension Benefit Plan [Member] | Principal pension plans [Member]    
Fair Value Of Plan Assets [Abstract]    
Beginning Balance $ 48,297 $ 44,738
Actual gain (loss) on plan assets 2,793 6,312
Employer contributions 236 225
Participant contributions 153 156
Benefits paid (3,199) (3,134)
Acquisitions (dispositions)-net 0 0
Exchange rate adjustments 0 0
Ending Balance 48,280 48,297
Pension Benefit Plan [Member] | Other Pension Plan, Defined Benefit [Member]    
Fair Value Of Plan Assets [Abstract]    
Beginning Balance 11,059 9,702
Actual gain (loss) on plan assets 1,537 1,212
Employer contributions 726 673
Participant contributions 9 14
Benefits paid (493) (477)
Acquisitions (dispositions)-net 0 (31)
Exchange rate adjustments (452) (34)
Ending Balance 12,386 11,059
Retiree Benefit Plan [Member]    
Fair Value Of Plan Assets [Abstract]    
Beginning Balance 903 946
Actual gain (loss) on plan assets 44 118
Employer contributions 518 533
Participant contributions 52 52
Benefits paid (704) (746)
Ending Balance $ 813 $ 903